/Engine/Plugins/Animation/ControlRig/Source/ControlRig/Public/Rigs/RigHierarchy.h
Sets a control's preferred euler rotation order
[UFUNCTION](Programming/UnrealArchitecture/Reference/Functions)(BlueprintCallable, Category=URigHierarchy) void SetControlPreferredRotationOrderByIndex ( int32 InElementIndex, EEulerRotationOrder InRotationOrder )